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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Networks, Repeaters, and QKD I (joint session Q/QI)

Q 2.3: Vortrag

Montag, 10. März 2025, 11:45–12:00, AP-HS

Heralded Generation of Atom-Photon Entanglement — •Gianvito Chiarella, Tobias Frank, Pau Farrera, and Gerhard Rempe — Max Planck Institute for Quantum Optics, Hans-Kopfermann-Straße 1, 85748 Garching bei München

Reducing inefficiencies and infidelity errors in quantum information processes is crucial for the successful implementation of advanced quantum communication and computation protocols. In this work, we introduce a novel method to mitigate such errors during the generation of atom-photon entanglement. The approach utilizes cascaded two-photon emission from a single atom coupled to two crossed optical cavities. The polarization state of one photon is entangled with the spin degree of freedom of the atom, while the emission of a second photon serves as a herald, signaling the successful entanglement generation. This heralding process effectively mitigates inefficiencies and infidelities in the entanglement, and we highlight the potential of our source for quantum communication applications over long distances.

Keywords: Atom; Entanglement; Photon; Photon-Pair; Cavity